1.[C,U]面包皮
2.[C,usually sing.]糕饼（尤指馅饼）酥皮
3.[C,U]（尤指软物或液体上面，周围的）硬层，硬表面
4.【地质学】地壳
5.【医学】痂，痂皮
6.【俚】老面皮；厚颜无耻 词形变化
- 形容词 crustless
- 时态 crusted，crusting，crusts
- the trait of being rude and impertinent; inclined to take liberties
- a hard outer layer that covers something
- form a crust or form into a crust
- the outer layer of the Earth